differ vs spar

differ

verb
  • To be separated in quantity. 

  • Not to have the same traits or characteristics; to be unalike or distinct. 

  • To have diverging opinions, disagree. 

noun
  • A program that diffs, a diff. 

spar

verb
  • To supply or equip (a vessel) with spars. 

  • To contest in words; to wrangle. 

  • To fight, especially as practice for martial arts or hand-to-hand combat. 

  • To strike with the feet or spurs, as cocks do. 

noun
  • Any crystal with readily discernible faces. 

  • A rafter of a roof. 

  • A thick pole or piece of wood. 

  • A beam-like structural member that supports ribs in an aircraft wing or other airfoil. 

  • A sparring session; a preliminary fight, as in boxing or cock-fighting. 

  • Any of various microcrystalline minerals, of light, translucent, or transparent appearance, which are easily cleft. 

  • Any linear object used as a mast, sprit, yard, boom, pole or gaff. 

How often have the words differ and spar occurred in a corpus of books? (source: Google Ngram Viewer )